22.7.3.1 The cond_instances Table

The cond_instances table lists
all the conditions seen by the Performance Schema while the
server executes. A condition is a synchronization mechanism
used in the code to signal that a specific event has happened,
so that a thread waiting for this condition can resume work.

When a thread is waiting for something to happen, the
condition name is an indication of what the thread is waiting
for, but there is no immediate way to tell which other thread,
or threads, will cause the condition to happen.